Low Conversion Losses up and Downconverters, Using Dielectric Resonators for Application with Millimetric Telecommunication Systems

This paper shows that it is now possible to design devices incorporating dielectric resonators for frequencies up to 40 GHz. Theoretical models have been studied in order to compute with the required accuracy the resonant frequency and coupling coefficients between two resonators and a resonator and a microstrip line. Frequency temperature coefficient variation less than 2 ppm/°C has been achieved using "composite structures". These new temperature compensated resonators have been used in association with a millimetric microstrip low noise mixer and with a millimetric waveguide up converter. In this way, the suppression of the image bandwidth frequency for mixers, or of the lower sideband for up converters leads to a decrease of conversion losses higher than 1 dB.